Chain saw



FIG. 1 is a top perspective view of the chain saw with a bar and chain;

FIG. 2 is a left side view of the chain saw shown in FIG. 1 without a bar and chain;

FIG. 3 is a right side view of the chain saw shown in FIG. 1 without a bar and chain;

FIG. 4 is a top view of the chain saw shown in FIG. 1 without a bar and chain;

FIG. 5 is a bottom view of the chain saw shown in FIG. 1 without a bar and chain;

FIG. 6 is a rear view of the chain saw shown in FIG. 1 without a bar and chain; and,

FIG. 7 is a front view of the chain saw shown in FIG. 1 without a bar and chain.

The subject matter shown in dashed lines, and any surfaces of the design not shown, including interior surfaces, form no part of the claimed invention. 

I claim the ornamental design for a chain saw, as shown and described. 